Given the data:. N2 (g) + O2 (g) → 2 NO (g) ΔH° = +180.7 kJ 2 NO (g) + O2 (g) → 2 NO2 (g) ΔH° = -113.1 kJ 2 N2O (g) → 2 N2 (g) + O2 (g) ΔH° = - 163.2 kJ
using Hess’s Law the ∆H for the reaction below is kJ:.
N2O (g) + NO2 (g) → 3 NO (g)

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

Standing in the sunlight and feeling the heat on your face (uv radiation is entering the skin, converting to infrared radiation, and is absorbed by your tissues)orstanding near a fire and feeling the heat on your skin (infrared radiation transfer)

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.